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© The Huntsville Times/Paul GattisAlred Marina on Lake Guntersville was damaged in an April 27 tornado track added Thursday by the National Weather Service.
Huntsville - The historic wave of tornadoes that struck the state on April 27 grew in number yet again on Thursday.

The National Weather Service office in Huntsville added four new tornado tracks, all in Marshall County, to raise the total to 37 separate tornadoes in North Alabama.

The Huntsville office on Friday also upgraded the deadly EF-4 that struck DeKalb County, raising the estimates to an EF-5. That's the most powerful level on the Enhanced Fujita scale, indicating winds exceeding 200 mph. The only other EF-5 on April 27 ran along the ground from Hackleburg to Madison County.

The National Weather Service office in Birmingham has also identified 30 tornadoes on April 27. Six of those tornadoes continued into North Alabama and were surveyed by both offices.

That means, according to the Huntsville office, the new statewide total is 61 separate tornadoes on April 27.

Of those, 14 touched down in Marshall County. The four latest to be identified were relatively minor. Three were EF-1; the fourth, an EF-0.

The new tracks added a second tornado hitting Lake Guntersville State Park, which was devastated by the storms. In addition to an EF-2 twister that severely damaged the campground at the state park, the National Weather Service now confirms a separate EF-1 caused damage near the park entrance and the golf course.

An EF-1 north of Guntersville was added after weather service surveys found a tornado was responsible for extensive damage at Alred Marina, as well as the Guntersville airport and Buck Island Road, where some residents were evacuated via boats.

An EF-1 touched down southwest of Guntersville near Browns Valley Road to Alabama 79. Uprooted trees and roof damage were found in the twister's path.

The EF-0 was near Bakers Chapel Lane north of Guntersville in the Claysville community. Uprooted trees were the only indications of damage.